JP4315432B2 - Stab prevention material and clothes using the same - Google Patents

Description

  The present invention relates to a cloth material for the purpose of protecting against a sharp cone-shaped blade such as an ice pick, and more particularly to a cloth material having an improved anti-stab effect by multiplexing.

  Conventionally, a person engaged in a dangerous mission such as a police officer or a guard member sometimes wears a blade-proof garment or a bulletproof vest in order to avoid the danger in advance. This type of protective garment is sewn using a strong chemical fiber cloth, etc., and it is surely strong. Although it has a sufficient protection against full-scale weapons, it has a weight of 1 to 3 kg. Due to poor workability and difficulty in appearance processing, it was not able to withstand daily use as clothing.

  In recent years, midnight crimes have been increasing against the background of 24-hour life, and robberies involving stabs with knives and knives for no reason have occurred frequently. Therefore, at convenience stores that operate late at night, clothing that sufficiently prevents the risk of heels is required. Under such circumstances, aramid fibers have been developed as high-performance fibers that not only can be worn comfortably as everyday outerwear, but also have sufficient protection against blades and workability. Various simple protective clothing using such protective fabrics have also been provided.

JP-A-6-174396 (paragraph number 0003) JP-A-11-183093 (paragraph numbers 0006 to 0011)

However, in the aramid fiber woven fabric, the blade-proof effect when cut with a blade parallel to the fabric surface is sufficiently recognized, but when pierced with a sharp blade perpendicular to the fabric surface, it is peculiar to the fabric. Since the slipperiness, which is a drawback, is large, there is almost no anti-stabing effect, and even when this fabric is laminated in multiple layers, the increase in the effect was hardly recognized.

  In view of such circumstances, the present invention is a lightweight, easy-to-wash and fashionable fiber that can be used in daily clothing, and a conventional fabric material having not only a blade-proof effect but also a stab-proof effect is used. It aims at providing using an aramid type fiber.

In order to achieve the above object, a knitted fabric made of aramid fibers is used in the antistab material according to the present invention. The first stab-proof material according to the present application is obtained by superposing a plurality of knitted fabrics knitted with aramid fibers of the same thickness, with the fabric surfaces thereof aligned. A knitted fabric having a high knitting density is used on the surface side and a knitted fabric having a sparser knitting density toward the lining side is used. Secret or sparse is a comparative concept.

  It is optimal to use three knitted fabrics each having a high density, a middle density, and a low density for superimposing the fabrics in the first antistool material.

  The second antistool material according to the present invention is a material in which both the thickness of the fiber and the knitting density are changed, and the knitted fabric with a dense knitting density of fine fibers is used on the outer side, and the lining side is used. Accordingly, a knitted fabric in which the knitting density of thick fibers is sparse is used to make a stab-proof material. The best way to stack the fabrics is to use three fabrics in order, one with a thin fiber thickness and one with a medium and thick thickness. In addition, the invention which concerns on Claim 3 provides the daily clothing using this antistab material. By configuring in this way, the following effects can be obtained.

The stab preventive material according to the present invention uses a knitted fabric of aramid fibers, which allows the cutting edge to enter the fiber without slipping even when pierced with a conical blade perpendicular to the knitted fabric surface. It can be captured until the yarn is cut. Therefore, by multiplying the dough, it is possible to improve the antistab effect that makes it difficult to penetrate the blades.

In addition, if a knitted fabric with the same knitting density of the aramid fibers (usually the same thickness of the aramid fibers) is overlapped, the quality and tactile sensation of the stab material according to the present invention while maintaining and improving the stab effect Can be made constant.

In particular, as in the case of the first stab material, while keeping the thickness of the aramid fiber used to be the same, use a fabric with a denser knitting density on the outer side and inside the knitting density as going to the lining side Using sparse fabric, the high-knit density knitted fabric on the surface effectively suppresses the initial entry of the cone-shaped blade, allowing the blade edge and the fabric to enter the medium-density knitted fabric without being cut. It becomes.

As a result, the medium density knitted fabric captures and tightens the blade edge to reinforce the strength of the fiber yarn located on the surface. Furthermore, the strength is further reinforced by entering the sparsely knitted fabric without cutting the fiber yarn. Accordingly, it is possible to dramatically improve the antistab effect while suppressing the amount of aramid fiber used as a whole.

Like the second anti-stab material, change both the thickness and knitting density of the fiber, use a knitted fabric with a dense knitting density of thin fibers on the outer side, and increase the knitting density of thick fibers as you go to the lining side. When using a knitted fabric with sparseness, the dense knitted fabric used on the outer fabric side not only makes it easy to capture the cutting edge, but also reduces the overall amount of aramid fibers while gradually reducing the knitting density. The lowered second and third knitted fabrics can grasp the cutting edge and the knitted fabric as one body, and can reinforce the anti-friction force of the knitted fabric.

When the number of the knitted fabrics made of aramid fibers is three, the stab-proofing effect of the material can be enhanced without deteriorating the workability due to the thickness of the fabric and the workability of the clothes. In addition to producing clothing using the antistab material as a surface material, by using it as an interlining or inner material, it is possible to produce clothing having a large anti-stab effect.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present invention, a knitted fabric knitted with an aramid fiber excellent in cut resistance is used. Even if it is made of an aramid fiber, the fabric cannot be used in the present invention because it has a high sliding property and cannot capture the cutting edge.

  Aramid refers to a synthetic linear polymer in which 85% or more of amide bonds are directly bonded to two aromatic rings. Either meta-aramid fiber (polymer with metaphenylenediamine) or para-aramid fiber (polymer with paraphenylenediamine) may be used. The thickness of the aramid fiber is not particularly limited, but it is preferable to use a fiber having a thickness between 100 denier and 500 denier for practical use. The method of knitting is not particularly limited, but the effect of preventing slipperiness cannot be obtained unless the knitting density has a certain degree of knitting density.

  The first embodiment of the present invention is a case where the thickness (denier = unit d) of the aramid fibers is not limited and three knitted fabrics are multiplexed to make a clothing fabric. As a method of making a clothing fabric, the fabric surfaces may be overlapped and stitched vertically and horizontally like quilting, or only the periphery may be stitched. FIG. 1 is a diagram for explaining the antistab effect of the fabric material multiplexed as described above. FIG. 1A is a conceptual cross-sectional view in the case of a single cloth, and FIG. 1B is a conceptual cross-sectional view in the case where three sheets are stacked.

  When the aramid fiber knitted fabric 1 is cut horizontally with a blade such as a knife 10 with respect to the knitted surface, a blade-proof effect is recognized from the characteristics of the aramid fiber. By the way, when the blade is stabbed perpendicularly to the knitted surface having a certain high knitting density, the tip of the blade does not slide off from the knitted surface as shown in FIG. It is possible to capture the entry of the cutting edge. Therefore, until the fiber yarn is rubbed or ruptured and cut, the cutting edge is tightened by its elasticity and does not penetrate the fabric surface of the knitted fabric 1.

  As shown in FIG. 1 (b), by overlapping the knitted fabrics, the captured cutting edge enters the second knitted fabric 2 before cutting the fiber yarn. Thereby, the overlapped second knitted fabric 2 captures the first knitted fabric 1 and the blade edge 11 and prevents the blade edge 11 from being rubbed or ruptured. The second knitted fabric 2 prevents the first knitted fabric 1 from rubbing or bursting, and the angle of the blade edge 11 when entering the second knitted fabric 2 from the first knitted fabric 1. Since angle A <angle B, the slip-off preventing effect of the second knitted fabric 2 is more effectively exhibited.

  When the cutting edge 11 enters the third knitted fabric 3, the first knitted fabric 1 and the second knitted fabric 2 are in a state of covering the cutting edge 11. The angle of the blade edge 11 at that time becomes angle B <angle C, and it becomes difficult to enter the third knitted fabric 3. Therefore, the first knitted fabric 1 and the second knitted fabric 2 are prevented from being rubbed and cut by the strong tensile stress of the aramid fibers, and the effect of stopping the entry pressure of the blade edge 11 applied perpendicularly to the knitted fabric is produced. This effect is increased by layering the knitted fabrics.

  Since the knitting density (gauge) of the knitted fabric is also related to the anti-stab effect, the second embodiment of the present invention has a constant knitted density of the aramid fiber, and the three knitted fabrics are multiplexed to make a clothing fabric. Is the case. In this case, it is possible not only to obtain the same antistab effect as that of the first embodiment, but also to ensure the uniformity of the touch as a clothing material.

  The third embodiment is a stab-proof material in which a plurality of knitted fabrics knitted with aramid fibers of the same thickness are stacked together with the fabric surfaces, and the knitted fabric 1 having a high knitting density is used on the outer side. In this case, the knitted fabrics 2 and 3 having sparse or the same knitting density are used as going to the lining side. In this case, the use of the aramid fiber as a whole can be reduced, and the anti-stab effect can be maintained equally.

  The fourth embodiment is a stab-proof material in which a plurality of knitted fabrics knitted with aramid fibers are overlapped with the fabric surfaces aligned, and a knitted fabric 1 having a high knitting density knitted with fine fiber yarns on the outer side. Is used, and the knitted fabrics 2 and 3 sparsely knitted with thicker fiber yarns are used as going to the lining side. In this case, the use of aramid fibers as a whole can be reduced, and the anti-stab effect can be improved.

  In order to demonstrate the above effects, the penetration strength of the knitted fabric was measured using a constant speed stretch type burst tester 20 shown in FIG. As shown in FIG. 2, the test piece 21 is placed with the front side facing up, and a uniform tension is applied so as not to cause wrinkles and sagging. Then, the specimen 21 is attached to the sample clamp table 22 having an inner diameter of 4.4 cm and pressurized at 50 cm per minute. The strength with which the knife 10 penetrates the sample at a speed was measured, and an average value of three times was taken.

  Sample 1 is a woven fabric (one piece of cloth) woven with 500-denier aramid fibers, and Sample 2 and below are knitted fabrics. Sample 2 is a knitted fabric (one piece of cloth) knitted at 250 denier, and sample 3 is a knitted fabric (one piece of cloth) knitted at 500 denier. Sample 4 is a fabric material obtained by superposing two knitted fabrics of 250 denier on the outer side and 500 denier on the lining side. Table 1 shows the penetration strength data obtained under these conditions for these samples.

  As can be seen from the results in Table 1, the knitted fabric (sample 2) knitted with 250 denier fiber yarns has less penetration strength than the woven fabric (sample 1) woven with 500 denier fiber yarns, but the fiber yarn thickness When the thickness is the same (500 denier), it can be seen that the knitted fabric has a greater penetration strength than the woven fabric. Also, a knitted fabric (sample 3) knitted with 500 denier fiber yarn, and a fabric material (sample 4, total of 750 denier) in which two knitted fabrics of 250 denier on the outer side and 500 denier on the lining side are overlapped. Comparing the penetration strengths of the two materials, it can be seen that the penetration strength of the dough material (sample 4) superposed on the two sheets is dramatically improved.

  As a sample 5, two knitted fabrics knitted with 250 denier fiber yarns 5, 6 and 4 knitted fabrics 4 knitted with 100 denier fiber yarns, one knitted fabric knitted with 100 denier fiber yarns as shown in FIG. Using a superposition of 3 sheets with 4 facing up, the penetration strength of the fabric material was measured under the same conditions using the constant speed extension type burst tester 20 shown in FIG.

  FIG. 3A shows a case where the cutting edge 11 of the knife 10 is applied from the front side, and FIG. 3B shows a case where the cutting edge 11 of the knife 10 is applied from the back side. In this test, the method of applying the cutting edge 11 of the knife 10 was attempted by three methods. When the direction of the blade edge 11 is aligned with the longitudinal mesh row (called a wale) of the knitted fabric, when the blade edge 11 is turned in a direction perpendicular to the wale direction (called the course), and an angle of 45 degrees with each direction. The difference in penetration strength was measured when it was directed to the direction (referred to as bias). The results are shown in Table 2.

  As can be seen from the results in Table 2, it can be seen that there is no significant difference in the test results between the wale direction and the bias direction, but the penetration strength increases when the blade edge 11 hits the course direction. Compared with the results of Sample 4 shown in Table 1, Sample 4 uses 750 denier as a whole and penetration strength is only 20.3 N, but sample 5 uses only 600 denier as a whole. Even if not, penetration strength can be improved up to 25.8N.

  In the sample 5, the knitted fabric 5 sandwiched between the outer side and the lining side is set to 250 denier, but even if this is set to 200 denier, the penetration strength hardly changes. Therefore, using a knitted fabric with high knitting density knitted with fine fiber yarns on the outer fabric side and knitting fabric with sparse knitting density knitted with thick fiber yarns as going to the lining side reduces the anti-barrier effect Without using it, it is possible to reduce the amount of aramid fiber yarn used.

  The antistab material of the present invention can be used not only as a fabric material such as a uniform used in a convenience store that operates at night, but also as an inner material such as a suit. Moreover, it can be used as a cover cloth in a place where it is necessary to prevent the penetration of the blade edge, and can be used in a portion that prevents the risk of wrinkles such as the dropping of a blade on a daily basis.

It is a figure for demonstrating the stab prevention effect of the fabric material multiplexed. (A) is a conceptual cross-sectional view in the case of a single cloth, and (b) is a conceptual cross-sectional view in the case where three sheets are stacked. It is the schematic of the constant-speed extension type bursting test machine used for the test of this invention. It is a figure which measures the penetration strength of the fabric material which concerns on the optimal Example of this invention, (a) is a case where the blade edge | tip of a knife is applied from the surface side, (b) is a blade edge | tip of a knife from a lining side. This is the case.

Explanation of symbols

1, 2, 3 knitted fabric 4, 5, 6 knitted fabric 10 knife 11 cutting edge 20 constant speed extension type burst tester 21 test piece 22 sample clamp stand

Claims (3)

  It is a stab-proof material in which a plurality of knitted fabrics knitted with aramid fibers of the same thickness are put together with the fabric surface, and the knitted fabric with a high knitting density is used on the outer fabric side, going to the lining side A stab-proof material using the knitted fabric with a lower knitting density.   It is a stab-proof material in which a plurality of knitted fabrics knitted with aramid fibers are aligned with the fabric surface, using the above-mentioned knitted fabric with fine fibers and dense knitting density on the outer fabric side, and going to the lining side A stab-proof material using the knitted fabric made of thicker fibers and less knitted density.   A garment using the antistab material according to claim 1 or 2.

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